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TRD-prototype test at KEK-FTBL

TRD-prototype test at KEK-FTBL. 11/29/07~12/6. The TRD prototype is borrowed from GSI group (thanks Anton). Univ. of Tsukuba Hiroki Yokoyama. KEK-FTBL. Beam Area. KEK, Fuji Test Beam Line 2007/11/29-12/6 3GeV/c,electron beam. TRD-prototype. setup. Scintillation Counter. TRD. MRPC.

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TRD-prototype test at KEK-FTBL

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  1. TRD-prototype testat KEK-FTBL 11/29/07~12/6 The TRD prototype is borrowed from GSI group (thanks Anton). Univ. of Tsukuba Hiroki Yokoyama

  2. KEK-FTBL Beam Area • KEK, Fuji Test Beam Line • 2007/11/29-12/6 • 3GeV/c,electron beam

  3. TRD-prototype

  4. setup Scintillation Counter TRD MRPC PbGlass for TOF Trig

  5. measurement Pad Response Function Amplification of signals (through anode voltage and gas dependence) Electron attachment (through drift voltage dependence) Drift velocity (through drift voltage and gas dependence) Absorption of TR-photon（absorption length in 2type gases, Ar+CO2(85,15),Xe+CO2(85,15)) Angle dependence of position resolution

  6. Pad Response Function Pulse height is defined as sum of three adjacent pad’s induced charges. distance from CM vs. proportion of induced charge to sum of them. Full width of signal sharing in azimuthal direction is 3pads. 6

  7. Gas Gain Mean pulse height Ar+CO2(85,15) Xe+CO2(85,15) Mean pulse height Drift Voltage -2100V Anode Voltage 1500V 1450V 1400V 1350V 1300V time time Anode voltage vs pulse height Ar+CO2(85,15) Xe+CO2(85,15) Pulse height at Amp region Gas gain by avalanche can be fitted by exponential function of anode voltage 7 7 Anode voltage

  8. Drift velocity Anode Voltage 1500V Drift Voltage -2100V -2000V -1900V -1800V -1700V Ar+CO2(85,15) Xe+CO2(85,15) Mean pulse height Mean pulse height time time Electric field vs Drift velocity Ar+CO2(85,15) Xe+CO2(85,15) Drift Velocity Drift velocity for Ar gas is about three times larger than that for Xe gas 8 8 Electric Field of Drift region

  9. Electron attachment a/b is defined as sign of electron attachment. Attenuation of signal by electron attachment b a a/b Ar+CO2(85,15) Xe+CO2(85,15) Stay time of electron The attenuation of signal by H2O or oxygen depends on time that electrons stay in the chamber. 9

  10. TR-photon signal(1) • Correct time distribution to be flat shape in the drift region Xe+CO2(85,15) before after Anode Voltage 1500V Drift Voltage -2100V With Radiator Without Radiator time time Ar+CO2(85,15) after before 10 10 time time

  11. TR-photon signal(2) • Calculate the TR photon contribution as the difference  between time distributions with/without radiator. • By slope of exponential fit, I calculated absorption length of TR-photon in each gas. TR-photon attachment absorption length Ar+CO2(85,15) Xe+CO2(85,15) • Depth of TRD-prototype is 30mm. • 95%(in Xe),28%(in Ar) TR-photon energy is absorbed. Depth of detector from drift electrode(mm) 11 11

  12. resolution in azumuthal direction Calculate center Pad number time Pad number time Data for fit Angle=20° Measure difference between this point and fited line Resolution(angle 0°)is about 400μm 12 12 1pad(=8mm)

  13. summary • Signal share is less than 3 pads. • Gas gain by avalanche can be fitted by exponential function of anode voltage. • Drift velocity in Ar gas is about three times larger than that in Xe gas. • The attenuation of signal by hydrogen and oxygen depends on time that electrons stay in the chamber. • absorption length in Xe(Ar) is 10mm(89mm) • Resolution(angle 0°) is 391μm.

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